Hyundai Forums banner

P0139 Oxygen (O2) Sensor

15K views 22 replies 12 participants last post by  jsvob03 
#1 ·
My check engine light came on a couple of days ago and the Advanced auto parts guy said it's P0139, "HO2S Circuit Slow Response Bank 1 Sensor 2". Of COURSE my Warranty ran out less than 1,000 miles ago (50,910, second owner). Hyundai is unwilling to lend me a hand and said I'm looking at around $200 for replacement.

My SO and I are both generally pretty capable of working on cars, would we be able to replace this ourselves to save some money? If so, what do you recommend I replace the o2 sensor with (brand, model #, factory, etc)? Anything else I need to know in order to replace this ourselves?

Thanks!
Theresa
 
#2 · (Edited)
Your warranty is 5 yrs or 60K miles. Still in bumper to bumper coverage by my calc.

Time to revisit dealer unless you made a typo.

As far as replacing O2 sensor, it should be pretty straightforward. Usually a large metric wrench and penetrating oil (liquid wrench or PB). Be sure to be very careful with the new one during install. Its been a while since I did one but they are a bear to get out as the exhaust heat pretty much welds them into the bung.

Best of luck on the repair.
 
#5 ·
Adogg was right, my warranty runs out at 60k, not 50k. I called the other local dealer and he confirmed it was 60...the first dealer told me 50.

Ironically my check engine light went off today, although I'll still be taking her in for service b/c I don't want it to magically come back at 60,001.

Thank you all for posting and trying to help me out. This forum has always been very helpful and I appreciate that.
 
#6 ·
Code should still be in the computer, just stored. A quick trip to the parts store (or to someone with an OBDII scanner) will confirm, then take this with you to the dealer. That way there wont be any "diagnostic fees".

Best of luck and hope you get it fixed up.

Also--never go back to that first dealer again. To lie to you straight up like gives you a good idea of how they do business.
 
#9 ·
And Emission Components...
7 years and 70k miles
Applies to vehicles manufactured to California specifications, which are distributed by Hyundai Motor America and registered in the states of California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, Oregon, Pennsylvania, Rhode Island, Vermont or Washington.

Got to hug your tree.
 
#13 ·
There is one before the catalytic converter and one after it. Sensor 2 will be the one after. Not sure exactly where though cause I've never looked. Start at the rear of exhaust and move forward, first set of wires running into it should be it. Someone else might be able to tell you more precisely.
 
#14 ·
So I popped code P0139, "HO2S Circuit Slow Response Bank 1 Sensor 2" on friday. After a few engine starts the code was gone so I figure if it popped again, straight to the dealer it will go. Tuesday comes (yesterday) and the car doesn't want to start, checked a few things and the battery went bad. Its a 5 year old battery so I bought a new one. So I was wondering not sure if it's possible but did the dieing battery have something to do with popping code P0139? I have made a few runs on the new battery and no codes have came up.
 
#17 ·
Ya I was getting the 14 volts. The battery's going on 5 years so I just replaced the battery since the alternator seems to be working. Cars been running good for a week now, I'm hoping the code I got was a false positive. I haven't got the code back and I didn't do anything with the O2 sensor. Anyone know where sensor 2 is? I know there is one by the CAT but I'm thinking that maybe sensor 1.
 
#21 ·
B1S2 is under car about even with front row seats.. look and see round cat with sensor sticking out the passenger side of cat body...

Because it is a "NON-FATAL" DTC, after "X" key cycle, logic may turn off MIL..... Code will be stored iin PCM until somebody go in and manually erase DTC

Just because light went off,, it does not mean DTC gone.. it there till somebody manually erase it from memory,, Zligh twas on to signal you that we have issue, check it out..

Flashing MIL with lumpy run (misfire) is to be serviced like yesterday into last week,,, misfires kill Hyundai catalyst pretty quick
 
#22 ·
Forgot to add,,, most of the "S2" codes we see is usually sensor fault, but have seen a good sum of them that been hit and bend sensor at bad angle (not warranty) or run over something that snags the pigtail and rip it apart (not warranty)
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top